Differential D18463 Diff 51722 head/sys/riscv/include/vmparam.h

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head/sys/riscv/include/vmparam.h

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	*/			*/
	#ifndef VM_LEVEL_0_ORDER			#ifndef VM_LEVEL_0_ORDER
	#define VM_LEVEL_0_ORDER 9			#define VM_LEVEL_0_ORDER 9
	#endif			#endif

	/**			/**
	* Address space layout.			* Address space layout.
	*			*
	* RISC-V implements up to a 48 bit virtual address space. The address space is			* RISC-V implements multiple paging modes with different virtual address space
	* split into 2 regions at each end of the 64 bit address space, with an			* sizes: SV32, SV39 and SV48. SV39 permits a virtual address space size of
	* out of range "hole" in the middle.			* 512GB and uses a three-level page table. Since this is large enough for most
				* purposes, we currently use SV39 for both userland and the kernel, avoiding
				* the extra translation step required by SV48.
	*			*
	* We limit the size of the two spaces to 39 bits each.			* The address space is split into two regions at each end of the 64-bit address
				* space:
	*			*
	* Upper region: 0xffffffffffffffff			* 0x0000000000000000 - 0x0000003fffffffff 256GB user map
	* 0xffffff8000000000			* 0x0000004000000000 - 0xffffffbfffffffff unmappable
				* 0xffffffc000000000 - 0xffffffc7ffffffff 32GB kernel map
				* 0xffffffc800000000 - 0xffffffcfffffffff 32GB unused
				* 0xffffffd000000000 - 0xffffffefffffffff 128GB direct map
				* 0xfffffff000000000 - 0xffffffffffffffff 64GB unused
	*			*
	* Hole: 0xffffff7fffffffff			* The kernel is loaded at the beginning of the kernel map.
	* 0x0000008000000000
	*			*
	* Lower region: 0x0000007fffffffff
	* 0x0000000000000000
	*
	* We use the upper region for the kernel, and the lower region for userland.
	*
	* We define some interesting address constants:			* We define some interesting address constants:
	*			*
	* VM_MIN_ADDRESS and VM_MAX_ADDRESS define the start and end of the entire			* VM_MIN_ADDRESS and VM_MAX_ADDRESS define the start and end of the entire
	* 64 bit address space, mostly just for convenience.			* 64 bit address space, mostly just for convenience.
	*			*
	* VM_MIN_KERNEL_ADDRESS and VM_MAX_KERNEL_ADDRESS define the start and end of			* VM_MIN_KERNEL_ADDRESS and VM_MAX_KERNEL_ADDRESS define the start and end of
	* mappable kernel virtual address space.			* mappable kernel virtual address space.
	*			*
	* VM_MIN_USER_ADDRESS and VM_MAX_USER_ADDRESS define the start and end of the			* VM_MIN_USER_ADDRESS and VM_MAX_USER_ADDRESS define the start and end of the
	* user address space.			* user address space.
	*/			*/
	#define VM_MIN_ADDRESS (0x0000000000000000UL)			#define VM_MIN_ADDRESS (0x0000000000000000UL)
	#define VM_MAX_ADDRESS (0xffffffffffffffffUL)			#define VM_MAX_ADDRESS (0xffffffffffffffffUL)

	/* 32 GiB of kernel addresses */
	#define VM_MIN_KERNEL_ADDRESS (0xffffffc000000000UL)			#define VM_MIN_KERNEL_ADDRESS (0xffffffc000000000UL)
	#define VM_MAX_KERNEL_ADDRESS (0xffffffc800000000UL)			#define VM_MAX_KERNEL_ADDRESS (0xffffffc800000000UL)

	/* 128 GiB maximum for the direct map region */
	#define DMAP_MIN_ADDRESS (0xffffffd000000000UL)			#define DMAP_MIN_ADDRESS (0xffffffd000000000UL)
	#define DMAP_MAX_ADDRESS (0xfffffff000000000UL)			#define DMAP_MAX_ADDRESS (0xfffffff000000000UL)

	#define DMAP_MIN_PHYSADDR (dmap_phys_base)			#define DMAP_MIN_PHYSADDR (dmap_phys_base)
	#define DMAP_MAX_PHYSADDR (dmap_phys_max)			#define DMAP_MAX_PHYSADDR (dmap_phys_max)

	/* True if pa is in the dmap range */			/* True if pa is in the dmap range */
	#define PHYS_IN_DMAP(pa) ((pa) >= DMAP_MIN_PHYSADDR && \			#define PHYS_IN_DMAP(pa) ((pa) >= DMAP_MIN_PHYSADDR && \
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